I love the way the colors work in this. I don't think it's too dark. Actually on my screen the darkest shade is just a dark gray. I think a suggestion I might have is to have a bit more of the bus/stop sign/lower part of the picture, because the way it cuts off is a little jarring to my eyes. But otherwise I like it a lot!
I think it looks pretty awesome, its certainly not too dark on my screen, but it is dark enough that it creates a really cool dynamic shift from the lighter top left to the dark bottom right. Also all of the red lights look so good